Basic Investigations on the New Acceleration Scheme with Large Amplitude Electron Plasma Waves
| Project/Area Number |
62460216
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
プラズマ理工学
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| Research Institution | Utsunomiya University |
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Principal Investigator |
NISHIDA Yasushi Faculty of Engineering, Utsunomiya University, 工学部, 教授 (00005315)
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| Co-Investigator(Kenkyū-buntansha) |
NAGASAWA Takeshi General Arts, Ashikaga Institute of Technology, 共通, 講師 (10118440)
HONZAWA Tadao Faculty of Engineering, Utsunomiya University, 工学部, 教授 (20023707)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥7,500,000 (Direct Cost: ¥7,500,000)
Fiscal Year 1988: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1987: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Keywords | Electron plasma wave / Resonance absorption / VpxB acceleration / Electron beam / Linear accelerator / Beam-plasma interaction / 共鳴吸収 / Vp×B加速法 / 波と粒子の相互作用 / 直交場加速器 / 線型加速器 / マイクロ波プラズマ相互作用 / 遅波回路 / Vp×B加速器 |
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| Research Abstract |
Large amplitude electron plasma waves are excited, when a high power microwave is irradiated to the nonuniform plasma with a static magnetic field. In this scheme, it is aimed to investigate the interactions between an electron beam and electron plasma waves under the effects of VpxB acceleration mechanism. In the fiscal year of 1987, we devoted to the design and construction of new system of experimental apparatus, and in that of 1988, we have performed the experimental investigations. For this purpose, we have made an electron-beam gun with a small size (diameter:3 cm, maximum acceleration voltage:500V, maximum beam current:300mA), which is settled in the overdense region for a resonance absorption of the electromagnetic wave. In the present stage, we have almost finished the experimental work for the first phase, and several new phenomena have been clarified.
1. When there is no magnetic field (B=0), precise investigations revealed that the interactions between electron plasma waves and an electron beam occured resonantly at Vp Vb under the controlled conditions and the mechanism for the particle trapping and its conditions are clarified.
2. When there is a static magnetic field, the VpxB acceleration scheme is formed and an efficient acceleration of electron beams are observed. In this case, a strong interacton also occurs at Vp Vb and the electron beams are accelerated 2.5-3 times of the initial injection energy.
We also constructed to demonstrate a new type electron linear accelerator which does not employ the plasma, but is based on the VpxB acceleration system. The experimental result shows more efficient and stable acceleration of electrons compared with a conventional linear accelerator.
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Report
(3 results)
Research Products
(21 results)
